Fairchild MMBZ5221B - MMBZ5257B Zener Data Handbook
Summary
This datasheet from Fairchild Semiconductor covers the MMBZ5221B through MMBZ5257B series of surface-mount Zener diodes in SOT-23 packages with a 5 percent tolerance. The document provides a complete electrical characteristics table covering Zener voltages from 2.4 V to 12 V across 18 device variants, each with their corresponding device marking codes (e.g., 18A for MMBZ5221B, 8S for MMBZ5242B), dynamic impedance values at both Zener current and knee current test points, and reverse leakage curr
Page 1 Text Content
Z5221B -M Z5257B Zener D iodes
November 2011
MMBZ5221B-MMBZ5257B Zener Diodes
Tolerance = 5%
CONNECTION DIAGRAM
SOT-23
Absolute Maximum Ratings * TA = 25°C unless otherwise noted Symbol Parameter Value Units PD Power Dissipation m W TSTG Storage Temperature Range -55 to +150 °C TJ Operating Junction Temperature +150 °C * These ratings are limiting values above which the serviceability of the diode may be impaired.
NOTES: 1)These ratings are based on a maximum junction temperature of 150 degrees C. 2)These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle operations.
Electrical Characteristics TA = 25°C unless otherwise noted
VZ (V)
Device Mark ZZ(Ω) @ IZ (m A) ZZK(Ω) @ IZK(m A) IR (μA) @ VR (V)
Min. Nor. Max.
MMBZ5221B 18A 2.28 2.4 2.52 1,200 0.25 1.0 MMBZ5223B 18C 2.565 2.7 2.835 1,300 0.25 1.0 MMBZ5226B 8A 3.135 3.3 3.465 1,600 0.25 1.0 MMBZ5227B 8B 3.42 3.6 3.78 1,700 0.25 1.0 MMBZ5228B 8C 3.705 3.9 4.095 1,900 0.25 1.0 MMBZ5229B 8D 4.085 4.3 4.515 1,000 0.25 5.0 1.0 MMBZ5230B 8E 4.465 4.7 4.935 1,900 0.25 5.0 2.0 MMBZ5231B 8F 4.845 5.1 5.355 1,600 0.25 5.0 2.0 MMBZ5232B 8G 5.32 5.6 5.88 1,600 0.25 5.0 3.0 MMBZ5233B 8H 5.7 6.0 6.3 7.0 1,600 0.25 5.0 3.5
MMBZ5234B 8J 5.89 6.2 6.51 7.0 1,000 0.25 5.0 4.0 MMBZ5235B 8K 6.46 6.8 7.14 5.0 0.25 3.0 5.0
MMBZ5236B 8L 7.125 7.5 7.875 6.0 0.25 3.0 6.0 MMBZ5237B 8M 7.79 8.2 8.61 8.0 0.25 3.0 6.5
MMBZ5238B 8N 8.265 8.7 9.135 8.0 0.25 3.0 6.5 MMBZ5239B 8P 8.645 9.1 9.555 0.25 3.0 7.0 MMBZ5240B 8Q 9.5 10.5 0.25 3.0 8.0 MMBZ5241B 8R 10.45 11.55 0.25 2.0 8.4 MMBZ5242B 8S 11.4 12.6 0.25 1.0 9.1 VF Forward Voltage = 0.9V Maximum @ IF = 10m A for all MMBZ5200 series
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com MMBZ5221B-MMBZ5257B Rev. B0
Page Summary Contents For Fairchild MMBZ5221B - MMBZ5257B Zener Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 4 |
| File Size | 145.18 KB |
| Published | July 07, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What is the recommended source for genuine Zener Diodes to ensure warranty coverage?
Purchases must be made directly from Fairchild or through Authorized Fairchild Distributors.
What does the datasheet indicate about the required tolerance of the MMBZ5200 series?
The specified tolerance for these Zener Diodes is 5%.
What are the absolute maximum temperature ratings for this component?
Storage temperature ranges from -55 to +150 °C, with an operating junction temperature limit of +150 °C.
If a part's datasheet contains 'Obsolete', what does that signify?
The product is not currently in production, and the datasheet is for reference information only.